Human Lung Model in Bell Jar
Product Code : EL-HSM-10492
Quick answer: The Human Lung Model in Bell Jar is a classic demonstration model of the breathing mechanism. Two balloons on a Y-tube act as the lungs inside a bell jar, and a stout rubber sheet across the base acts as the diaphragm. Pulling the sheet down makes the balloons inflate; releasing it lets them deflate. Lab Exports manufactures it in Delhi for schools, colleges and universities.
Specifications
| Part | What it represents |
|---|---|
| Two balloons | The lungs |
| Y-tube | The trachea dividing into the two bronchi |
| Bell jar with open top | The chest (thoracic) cavity |
| Stout rubber sheet across the open base | The diaphragm |
How the breathing experiment is done
The model demonstrates that breathing is driven by pressure changes in the chest. When the diaphragm contracts it flattens and moves down, increasing the volume of the thoracic cavity. At constant temperature, pressure falls as volume rises (Boyle's law), so air flows in and the lungs expand. When the diaphragm relaxes, the volume falls, the pressure rises and air is pushed out.
- Hold or support the bell jar so that the rubber sheet across its base can be pulled freely.
- Point out the balloons as the lungs, the Y-tube as the airway and the rubber sheet as the diaphragm.
- Pull the rubber sheet gently downwards: the pressure in the jar falls and the balloons inflate, as in inhalation.
- Release the sheet: it returns to position, the pressure rises and the balloons deflate, as in exhalation.
- Repeat slowly and ask students to match each movement to the diaphragm in the body.
The model is a simplification: it shows the role of the diaphragm but not the movement of the ribs and intercostal muscles, which also change chest volume. That gap makes a useful discussion point with older students.
Key features
- Classic bell jar demonstration of diaphragm-driven breathing
- Two balloons on a Y-tube show inhalation and exhalation clearly
- Stout rubber-sheet diaphragm for repeated hands-on operation
- Bell jar with open top represents the chest cavity
- Simple to operate in front of a class
Documentation and supply
Most Lab Exports products carry a one-year manufacturer warranty.
Lab Exports manufactures the Human Lung Model in Bell Jar at its works in Laxmi Nagar, Delhi, and supplies it to schools, colleges and universities in India and 60+ countries, handling the export documents for each shipment. More about the company is on the About Lab Exports page.
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The full range is in the Human System Model section of the Biology Lab range.
Frequently asked questions
What does the lung model in bell jar demonstrate?
How the lungs fill and empty with air as the diaphragm contracts and relaxes, through the change of pressure inside the chest cavity.
What acts as the diaphragm in the model?
A stout rubber sheet stretched across the open base of the bell jar.
What is the price of the Human Lung Model in Bell Jar?
Prices are not published on the website. Add the Human Lung Model in Bell Jar to the Enquiry Cart with the Add To Cart button on this page, or email [email protected] with the house code EL-HSM-10492 and the quantity, to receive a quotation.
Does Lab Exports manufacture the Human Lung Model in Bell Jar?
Yes. Lab Exports manufactures the Human Lung Model in Bell Jar at its works at 11/315, Lalita Park, Laxmi Nagar, Delhi 110092, under house code EL-HSM-10492.
Request a quote
Email [email protected] with the house code EL-HSM-10492 and the quantity, or add the Human Lung Model in Bell Jar to the Enquiry Cart with the Add To Cart button on this page. Tender buyers can also see the Tenders and OEM page.
